Some of the heat near the surface of the earth _____ electricity.
| A．is used to making | B．are used for making |
| C．is used to make | D．are used to make |
_____time goes by, my grandfather’s memory seems to get worse and worse.
| A．Though | B．As | C．Because | D．Since |
Mr. Li lent me a book last week, _____I have learned a lot about earthquakes.
| A．to which | B．for which | C．from which | D．with which |
--- Have you moved into the new office building?
---Not yet .It ______
| A．is decorating | B．has been decorated |
| C．is being decorated | D．has been decorating |
Tourists were told _____their sunglass to protect their eyes from the strong sunlight
| A．to not take off | B．not to take off |
| C．not taking off | D．not take off |
She opened the handbag but couldn’t find the money _____she was to buy dog food.
| A．for which | B．with which | C．by that | D．of that |